[Android] Allow gtests to pull app data off the device before clearing it.

build/android/pylib/device/device_utils_test.py

 #!/usr/bin/env python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Unit tests for the contents of device_utils.py (mostly DeviceUtils).
 """
 
 # pylint: disable=C0321
@@ skipping 318 matching lines @@
 
   def testGetApplicationPath_fails(self):
     with self.assertCalls(
         (self.call.adb.Shell('getprop ro.build.version.sdk'), '19\n'),
         (self.call.adb.Shell('pm path android'),
          self.CommandError('ERROR. Is package manager running?\n'))):
       with self.assertRaises(device_errors.CommandFailedError):
         self.device.GetApplicationPath('android')
 
 
+class DeviceUtilsGetApplicationDataDirectoryTest(DeviceUtilsTest):
+
+  def testGetApplicationDataDirectory_exists(self):
+    with self.assertCall(
+        self.call.device._RunPipedShellCommand(
+            'pm dump foo.bar.baz | grep dataDir='),
+        ['dataDir=/data/data/foo.bar.baz']):
+      self.assertEquals(
+          '/data/data/foo.bar.baz',
+          self.device.GetApplicationDataDirectory('foo.bar.baz'))
+
+  def testGetApplicationDataDirectory_notExists(self):
+    with self.assertCall(
+        self.call.device._RunPipedShellCommand(
+            'pm dump foo.bar.baz | grep dataDir='),
+        self.ShellError()):
+      self.assertIsNone(self.device.GetApplicationDataDirectory('foo.bar.baz'))
+
+
 @mock.patch('time.sleep', mock.Mock())
 class DeviceUtilsWaitUntilFullyBootedTest(DeviceUtilsTest):
 
   def testWaitUntilFullyBooted_succeedsNoWifi(self):
     with self.assertCalls(
         self.call.adb.WaitForDevice(),
         # sd_card_ready
         (self.call.device.GetExternalStoragePath(), '/fake/storage/path'),
         (self.call.adb.Shell('test -d /fake/storage/path'), ''),
         # pm_ready
@@ skipping 1351 matching lines @@
       devices = device_utils.DeviceUtils.HealthyDevices()
     self.assertEquals(1, len(devices))
     self.assertTrue(isinstance(devices[0], device_utils.DeviceUtils))
     self.assertEquals('0123456789abcdef', devices[0].adb.GetDeviceSerial())
 
 
 if __name__ == '__main__':
   logging.getLogger().setLevel(logging.DEBUG)
   unittest.main(verbosity=2)